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首页> 外文期刊>日本草地学会誌 >Root weight as a principal factor responsible for difference in nitrogen absorption among orchardgrass (Dactylis glomerata L.), meadow fescue (Festuca pratensis Iluds.) and timothy (Phleum pratense L.) during first growing period
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Root weight as a principal factor responsible for difference in nitrogen absorption among orchardgrass (Dactylis glomerata L.), meadow fescue (Festuca pratensis Iluds.) and timothy (Phleum pratense L.) during first growing period

机译：根重是造成果园第一生长期果园草（Dactylis glomerata L.），草甸羊茅（Festuca pratensis Iluds。）和豆蔻（Phleum pratense L.）氮吸收差异的主要因素。

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Three temperate grass species (orchardgrass ; OG, meadow fescue ; MF, and timothy ; TY) were grown under solution culture condition from beginning of re-growth in spring to heading stage (first growing period) in order to elucidate the role of rootmass and its activity in nitrogen (X) absorption. We used dry root weight per plant (RW} and root length per plant (RL) as parameters for root mass and also X uptake per unit RW (NRW) and X uptake per unit RL (NRL) as parameters for root activity. Dry matter production, leaf area and the amount of N absorbed by the grass showed significantly positive correlation with each other, indicating that N accumulation in the grass increased leaf area and resulted in increasing dry weight of the grass. All grassspecies tended to have similar relationships to those described above. Nitrogen absorption is, therefore, the most important factor for the control of dry matter production of grasses during the growing period. The amount of N absorbed by TY was the greatest among the three grass species and that of MF, the least. Since NRW and NRL of MF proved almost equal to those of TY during the growing period, the difference in the N absorption between TY and MF was due to the difference in the parameters of root mass, particularly, in RW. The amount of N absorbed by OG during the first half of the growing period was almost the same as that of TY. In this first half of the growing period, N absorption by OG was supported by higher root activity, NRW and NRL, compared with those of TY. During the second half, however, the amount of X absorbed by OG was less than that of TY, although the higher root activity of OG continued until the lime of first cutting. This was mainly caused by smaller RW of OG compared with that of TY. From the results we conclude that RW, one of the parameters of root mass, is the principal factor responsible for difference in the X absorption among OG, MF and TY grown under solution culture condition.
机译：从春季开始重新生长到抽穗期（初生期），在固溶培养条件下种植了三种温带草种（果园; OG，草甸羊茅; MF和timothy; TY），以阐明根瘤菌和根瘤菌的作用。它在氮（X）吸收中的活性。我们使用每株植物的干燥根重（RW}和每株植物的根长（RL）作为根质量的参数，还使用每单位RW（NRW）的X吸收和每单位RL（NRL）的X吸收作为根系活动的参数。草的产量，叶面积和氮的吸收量之间存在显着的正相关关系，表明草中氮的积累增加了叶的面积，并导致草的干重增加，所有草种之间的关系都相似。因此，氮的吸收是控制生长期草干物质生产的最重要因素，在三种草种中，TY吸收的氮量最大，而MF的吸收量最少。由于在生长期间MF的NRW和NRL几乎与TY相等，因此TY和MF之间的氮吸收差异是由于根质量参数的差异，尤其是在RW中。生长期上半年OG吸收的N的t几乎与TY相同。在生育期的前半段，与TY相比，OG吸收的氮得到更高的根系活性，NRW和NRL的支持。在下半年，OG吸收的X量少于TY，尽管OG的较高根系活性一直持续到第一次切割石灰为止。这主要是由于与TY相比，OG的RW较小。从结果可以得出结论，RW是根质量的参数之一，是在溶液培养条件下生长的OG，MF和TY之间X吸收差异的主要因素。

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